It looks like it depends on which greek text a Bible version uses.
Look at the KJV/Young's and NASB/Rotherham for example. The W-H and Alexandrian texts are the same as what is used in the NASB/Rotherham it seems. I generally don't see 4 greek texts split evenly like this.
Search for 'Genesis 1:1' in the version
KJV) 1 Corinthians 9:20 And unto the Jews I became as a Jew, that I might gain the Jews; to them that are under the law, as under the law, that I might gain them that are under the law;
Young) 1 Corinthians 9:20 and I became to the Jews as a Jew, that Jews I might gain; to those under law as under law, that those under law I might gain;
NASB) 1 Corinthians 9:20 To the Jews I became as a Jew, so that I might win Jews; to those who are under the Law, as under the Law
though not being myself under the Law, so that I might win those who are under the Law;
Rotherham) 1 Corinthians 9:20 Therefore became I to the Jews as a Jew,--that Jews I might win; to them who were under law as under law,
not being myself under law,--that them who were under law I might win;
1st Corinthians 9 - Parallel Greek New Testament - HTML Bible by johnhurt.com
Textus Rec.)
1 Corinthians 9:20 kai egenomhn toiV ioudaioiV wV ioudaioV ina ioudaiouV kerdhsw toiV upo nomon wV upo nomon ina touV upo nomon kerdhsw
Byz./Maj.)
1 Corinthians 9:20 kai egenomhn toiV ioudaioiV wV ioudaioV ina ioudaiouV kerdhsw toiV upo nomon wV upo nomon ina touV upo nomon kerdhsw
W-H )
1 Corinthians 9:20 kai egenomhn toiV ioudaioiV wV ioudaioV ina ioudaiouV kerdhsw toiV upo nomon wV upo nomon
mh wn autoV upo nomon ina touV upo nomon kerdhsw
Alexandrian
1 Corinthians 9:20 kai egenomhn toiV ioudaioiV wV ioudaioV ina ioudaiouV kerdhsw toiV upo nomon wV upo nomon
mh wn autos upo nnomo ina touV upo nomon kerdhsw